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Marketable Securities (Tables)
9 Months Ended
Sep. 30, 2011
Marketable Securities [Abstract] 
Components Of Marketable Securities
                                 
            Gross     Gross        
    Amortized     Unrealized     Unrealized        
    Cost     Gains     Losses     Fair Value  
    (In thousands)  
Municipal bonds
  $ 6,655     $ 7     $     $ 6,662  
Corporate bonds
    8,765             (24 )     8,741  
Commercial paper
    15,968       5       (11 )     15,962  
 
                       
Total
  $ 31,388     $ 12     $ (35 )   $ 31,365  
 
                       
Balance Sheet Classification Of Marketable Securities
                 
    September 30     December 31  
    2011     2010  
    (In thousands)  
Marketable securities
  $ 29,830     $  
Marketable securities — long term
    1,535        
 
           
Total
  $ 31,365     $